Greenhouse construction.



J. F. M. FARQUHAR. GREENHOUSE GONSTRUUTION.

APPLICATION FILED SEPT. 15, 1906.

- Patented July 13, 1909.

a r .k W W5 & I J 5% Z JAMES F. M. FARQUHAR, OF BOSTON, MASSACHUSETTS.

GREENHO' USE CONSTRUCTION.

To all whom it may concern:

Be it known that 1, JAMES F. M. FARQU- HAR, a citizen of the United States, and resident of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Greenhouse Construction, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention relates to sash bars for skylights, green houses and glass roofs general and the manner of securing the glass thereto.

One embodiment of the invention will be described and then the novel features thereof will be pointed out in the appended claim.

In the drawings Figure 1 shows, in per- 1 spective, a portion of a glass roof or skylight embodying my invention. Fig. 2 shows a modification.

I propose to make my improved sash bar anchor shaped in cross section as shown in the drawings, that is, it has a central web 3, from which project the oppositely extending glass-receiving flanges 4 and the oppositel extending flanges 5 which form, with the ii 3, the gutters 6. The glass-receiving flanges 4 are situated between the edges of theweb 3, so that a portion 7 of said web projects above the flanges, while the other flanges 5 are at the lower edge of the web.

The lass 8 of the roof or skylight is supported y the flanges 4, as shown in the drawmg, and between the glass and the flanges 4 and also between said glass and the ortion 7 of the web, I propose to use a suite le packing, 9 which may be felt, asbestos, or any similar material which is vieldable and which will not become her or inelastic. The lass is held in place by means of a cap 10 wflich is shown in the form of a semi-circular strip that overlies and embraces the portion 7 of the web, said cap 10 being held in lace by suitable screws 11. In order to old the lass firmly in position without incurring t e dan er of the glass breaking, owing to unequa expansion'of material, or from any other cause, I ropose to interpose some of the packing 9 etween the cap 10 and the glass and also between said cap and the portion 7 of the rib.

As shown in the drawings, the packing-9 fills the space beneath the cap, forms a cush-' ion between the cap and the glass and also a Specification of Letters Patent.

Application filed September 15, 1906. Serial No. 334,772.

Patented. July 13, 1909.

cushion between the glass and the sash bar.

The packing serves two purposes, first, itfills I and seals the joint between the glass and the sash bar, and thus prevents leakage, and sec-. ond, it acts as a cushion for the glass. It also makes a cushion between the glass and the cap and between the cap and the sash bar. This cushioning eflect is important because it prevents the glass from being cracked. by unequal expansion of theglass and metal sash-bar. One of the principal reasons why the glass of skylights and greenhouse roofs become cracked or broken is because the glass is unyieldingly held in place and becomes broken by the expansion and contraction of the metal sashbars. In my present invention I have aimed to prevent all this by using a cushioning material between the glass and both the sash-bar and retaining cap, and I not only use a material which remains elastic and does not become inelastic as putty does but I use sufficient material to aflord the necessary elastic bed for the glass.

If desired, suitable springs 12 may be em-.

ployed between the head of the screws 1 1 and the cap, as shown in Fig. 2 these springs serving to still further cushion the cap.

The sash bar herein shown is of such a shape that it can be readily rolled and may thus be made of iron, although my invention contemplates the use of any suitable material in manufacturing it.

Having described my invention, what I claim as new and desire tosecure by Letters Patent is In a skylight, a sash-bar made as an integral structure and presenting a web, two

oppositely-extending glass-receiving flanges an two oppositely-extending flanges 5 at the lower edge thereof, combined with glass sustained by the glass-receiving flan es,'a

cap covering the upper edge of the we and extending over the edge of the glass, yielding means to hold the cap to therweb, and a felt cushion interposed between the glass and the lass-receiving flanges and fillin the s ace etween the glass and the sash ar an the ca In testimony whereof, I have signed my name to this specification, in the presence of two subscribim witnesses.

JiMEs F. M. FARQUHAR. Witnesses:

LOUIS 0. SMITH, MARGARET A. FEENEY. 

